Apparatus for impregnating wood, &amp;c.



F. MOLL.

APPARATUS FOR IMPREGNATING WOOD, 8541.

APPLICATION FILED JULY 23,1013.

1 1 22,407, Patented Dec. 29, 1914.

pairs s'rarr s FRIEDRLGH MOLL. OF BERLIN-STITDEN'DE, GERMANY.

APPARATUS FOR IMPREGNATING \VOOD, &c.

Specification of Letters Patent.

Application filed July 23. 1913. Serial No. 780,702.

lie it known that l. lfi'unDuici-r Moan. a. su ject of the Norman lim ieror. and reident oi Brandenburgisehestrasse 24. Brrlin- Siidende, Germany. have invented certain new and useful improvements in .-\pp'aratus for impregnating \Vord. &c. of which the following is a specification.

My invention relates to an apparatus for impregnating wood and other porous mate rials under pressure with metallic salts which will corrode metallic vessels.

Of the commonly adopted substances for impregnating wood and so forth, the most effective is chlorid of mercury (sublin'iate). According to the process given out by Kyan in 1832, the materials or objects for impregnation are immersed in solutions of the salt contained in basins of wood or cement. Impregnaticn under pressure would be much more eifective as the salt would then be caused to penetrate throughout the whole albul'nuni' or sapwood which the various previous attempts have "failed to carry out. In 18% Dr. Birkhetlr of London and later a I-Iollandish firm have tried the Kyan procin iron cylinders lined with such substances as tar, asphalt. lead. The linings which were to serve in preventing the direct crntaet of the solution of sumblimate with the iron parts oi the high-pressure vessels were so expensive to make that a commercial working of the process was not possible. lvloreover, the vessels, even those provided by Kyan, became soon corroded notwithstanding their linings.

The object of this invention is to provide a suitable construction of vessels for the aforesaid purpose from materials which are not liable to corrosion by the sublimate. The materials suitable for this purpose are chiefly concrete and wood.

The apparatus according to the present invention is shown in the accompanying drawing by way of example.

Figure 1 is a longitudinal section through the apparatus, and Fi 2 a cross section.

a is the tank containing the impregnat-I ing solution; upon this tank is situated the impregnating vessel 6 which is connected with the tank a by means of pipes c, and is closed by a removable cover 7).

d is the measuring vessel, which is connected to the impregnating vessel b by means of a pipe 0. It cylindrical vessels are used. they may be rendered stronger by means of iron hoops or plates. and when the vessels are made of concrete. they may be suitably reinforced. as shown at in the drawing. These vessels can also he used for impregnating materials with other metallic salts which cannct he used in iron vessels, such as copper sulfate which separates out on to the iron walls. or acid fluorid of zinc which according to the present invention is used 111 a wooden vessel of cylindrical form and reinforcedfor carrying out impregnation under pressure.

In order to prevent c rrosion of the t ucks 7 for carrying the wood into the cylindrical vessel 1). the trucks 7 are also made of materials which will nct be attacked by the impregnating solution. and they are preferably made of wood. The trucks 9 move on wheels, rollers or balls connected with the same. or they run over rolls h or balls of hard wood. such as lignunrvitac or terehinth-tree. seated in the floor portion Z) of the cylinder b. As with this arrangement-of apparatus only shortpipe connections such as c and c. are desirable. it is necessary to have the tank a, the impregnating cylinder 7) and the measuring vessel (Z close together and connect the same by means of reinforced earthenware pipes, butwhen they are very short they may consist of iron coated with vulcanized rubber. and they may be fitted with turning disks to serve as valves.

lVhat I claim as my invention and desire to secure by Letterslatent is 1. An apparatus for impregnating wood and porous materials under pressure with metallic salts which corrode metallic vessels comprising an unlined impregnating cylinder of reinforced concrete in combination with connections and vessels for creating pressure and supplying the impregnation solution as described.

2. An apparatus for impregnating materials under pressure. consisting of a lower vessel with prepared impregnating solution of non-corrosive material, a superposed non corrosive unlined impregnating cylinder suitably strengthened and reinforced and non-corrosive pipe connections between said vessels, as described.

3. An apparatus for impregnating mate rials under pressure,

consisting of a non- I 

